After weeks of rumours, the 32-year-old announced she is pregnant again with a sweet tweet on Christmas morning. The singer posted a photo on Christmas morning of her seven-month-old, Maxwell, playing outside, with the words "Big Sis" written in the sand. "Merry Christmas from my family to yours," is the picture's caption.
Jessica confirmed she was expecting her first baby with fiancé Eric Johnson during a similarly playful post - she wrapped herself in bandages to bress up as a mummy for Halloween in October 2011 and wrote: "It's true, I'm going to be a mummy!"
After welcoming Maxwell on May 1, Jessica lost 50lbs and was unveiled as the new face of Weight Watchers. The company have confirmed that she has put her diet on hold since discovering she is expecting, but will remain the company spokesperson and feature in a new commercial in which she announces her pregnancy.
The company said: "Jessica will not be following the programme during the pregnancy while her weight and well-being are monitored by her obstetrician."
Jessica is currently soaking up the sun in Hawaii with her former footballer fiancé Eric on a Christmas break with their seven-month-old. Other family members are also joining in the fun, among them Jessica's mother Tina, sister Ashlee Simpson and nephew Bronx.
One family member who is absent is the star's father Joe Simpson, who split from Tina earlier this year.
All the news as Duchess Kate's due date draws close...